<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../../vue.js"></script>
</head>

<body>
  <div id="app">
    <h1>{{msg}}</h1>
  </div>
  <script>
    Vue.config.productionTip = false;
    const vm = new Vue({
      data() {
        return {
          msg: "hello vue!"
        }
      },
      methods: {}
    })

    // vm.$mount('#app')

    //延时挂载
    setTimeout(() => {
      vm.$mount('#app')
    }, 3000)
  </script>
</body>

</html>